--- title: "TCP/IP applications; IPv4 vs IPv6 routing" subject: "Internet and Intranet" chapter: 2 key: "semester_8/internet_and_intranet:tcpip-application-ipv4-ipv6-routing" source: https://www.bctengineer.com/q/semester_8/internet_and_intranet/tcpip-application-ipv4-ipv6-routing site: BCT Engineering --- # TCP/IP applications; IPv4 vs IPv6 routing Internet and Intranet · Chapter 2: Internet Protocol Overview - Asked in: 2073 Bhadra, 4+4 marks - Video: [Internet Protocol - IPv4 vs IPv6 as Fast As Possible](https://www.youtube.com/watch?v=aor29pGhlFE) — Techquickie - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/internet_and_intranet/tcpip-application-ipv4-ipv6-routing - Whole chapter: https://www.bctengineer.com/md/semester_8/internet_and_intranet/chapter-2 ## Question What is the application of TCP/IP? Compare IPv4 and IPv6 on the basis of routing. ## Short answer TCP/IP supports web, email, file transfer, remote login, DNS, network management, VoIP, VPNs, and IoT. IPv4 uses 32-bit addresses, large routing tables, and router fragmentation; IPv6 uses 128-bit hierarchical addresses, smaller aggregated tables, fixed header, no router fragmentation, and neighbor discovery. ## Answer #### Applications of TCP/IP TCP/IP is the protocol suite on which the Internet and almost all private networks run. It lets different types of computers and networks communicate. Applications include: - **World Wide Web:** HTTP/HTTPS over TCP for browsing, e-commerce, online banking. - **E-mail:** SMTP, POP3, IMAP. - **File transfer and sharing:** FTP, SFTP, cloud storage. - **Remote login and administration:** SSH, Telnet, remote desktop. - **Name resolution:** DNS translates names to IP addresses. - **Network management:** SNMP, ICMP (ping, traceroute), DHCP, NTP. - **Real-time communication:** VoIP, video conferencing, streaming (RTP over UDP). - **Intranets, extranets and VPNs:** private networks using the same protocols. - **Internet of Things and mobile apps:** smart devices, remote monitoring, messaging. #### IPv4 vs IPv6 on the basis of routing | Basis | IPv4 | IPv6 | |---|---|---| | Address size | 32 bit | 128 bit | | Address structure | Classful then CIDR, uneven, much fragmentation of blocks | Hierarchical, designed for aggregation; /48 per site, /64 per subnet | | Routing table size | Very large (many small prefixes) | Smaller because of aggregation | | Header | Variable, 20-60 bytes, checksum recalculated at each hop | Fixed 40 bytes, no checksum, faster forwarding | | Fragmentation | Routers may fragment | Routers never fragment | | Routing protocols | RIPv2, OSPFv2, EIGRP, IS-IS, BGP-4 | RIPng, OSPFv3, EIGRP for IPv6, IS-IS, MP-BGP | | Next-hop address | Interface IP in the same subnet | Often the neighbour's link-local address (fe80::) | | Address resolution | ARP, broadcast | Neighbour Discovery (ICMPv6, multicast) | | Default route | 0.0.0.0/0 | ::/0 | | Route discovery by hosts | Static gateway or DHCP | Router Advertisement gives prefix and gateway | | Broadcast | Yes | No, replaced by multicast | ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Which TCP/IP application translates names into IP addresses? A. DHCP B. SNMP C. DNS D. NTP Answer: C. DNS performs name resolution, translating domain names to IP addresses. (Key point: DNS application) 2. Why do IPv6 routing tables tend to be smaller than IPv4 ones? A. IPv6 uses 128-bit addresses that are compressed B. IPv6 addressing is hierarchical and designed for aggregation C. IPv6 routers do not store routes D. IPv6 uses broadcast to find routes Answer: B. Hierarchical allocation (/48 per site, /64 per subnet) lets prefixes be aggregated; IPv4 has many small uneven prefixes. (Key point: Routing table size) 3. Which header feature makes IPv6 forwarding faster than IPv4? A. Variable length 20-60 bytes B. A checksum recomputed at each hop C. A fixed 40-byte header with no checksum D. Router fragmentation Answer: C. IPv6 has a fixed 40-byte header and no checksum, so routers do less work per hop. (Key point: Header processing) 4. In IPv6 routing, what is typical for the next hop and the default route? A. Neighbour's link-local address (fe80::) and ::/0 B. Broadcast address and 0.0.0.0/0 C. Global address of the destination and ::1/128 D. ARP-resolved address and 255.255.255.255 Answer: A. IPv6 next hops are often link-local fe80:: addresses and the default route is ::/0. (Key point: IPv6 next hop and defaults) ## Related in Internet and Intranet - [IPv4 vs IPv6 datagram fragmentation](https://www.bctengineer.com/question.md?key=semester_8%2Finternet_and_intranet%3Aipv4-ipv6-fragmentation) — Internet and Intranet, chapter 2, asked 2× - [IPv6 migration; IPv4 vs IPv6 packet structure](https://www.bctengineer.com/question.md?key=semester_8%2Finternet_and_intranet%3Aipv6-migration-router-packet) — Internet and Intranet, chapter 2 - [RFC and IPv4/IPv6 fragmentation](https://www.bctengineer.com/question.md?key=semester_8%2Finternet_and_intranet%3Arfc-fragmentation-ipv4-ipv6) — Internet and Intranet, chapter 2 ## Related in other subjects - [Compare IPv6/IPv4 headers; migration](https://www.bctengineer.com/question.md?key=semester_7%2Fcomputer_networks_and_security%3Aipv6-ipv4-header-migration) — Computer Networks and Security, chapter 7, asked 2× - [Compare OSI and TCP/IP models](https://www.bctengineer.com/question.md?key=semester_7%2Fcomputer_networks_and_security%3Aosi-vs-tcpip) — Computer Networks and Security, chapter 1, asked 4× - [IPv4 drawbacks solved by IPv6](https://www.bctengineer.com/question.md?key=semester_7%2Fcomputer_networks_and_security%3Aipv4-drawbacks-ipv6-advantages) — Computer Networks and Security, chapter 7, asked 2× - [Factors for IPv6; IPv4 to IPv6 transition](https://www.bctengineer.com/question.md?key=semester_7%2Fcomputer_networks_and_security%3Aipv6-factors-transition) — Computer Networks and Security, chapter 7, asked 2×